{
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\begin{tabular*}{\hsize}{@{\hskip\tabcolsep\extracolsep\fill}l*{6}{c}}
\toprule
                           &\multicolumn{2}{c}{Democratic Vote}          &\multicolumn{2}{c}{Republican Vote}          &\multicolumn{2}{c}{Incumbent Vote}           \\\cmidrule(lr){2-3}\cmidrule(lr){4-5}\cmidrule(lr){6-7}
                           &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}&\multicolumn{1}{c}{(4)}&\multicolumn{1}{c}{(5)}&\multicolumn{1}{c}{(6)}\\
                           &\multicolumn{1}{c}{Model}&\multicolumn{1}{c}{Model}&\multicolumn{1}{c}{Model}&\multicolumn{1}{c}{Model}&\multicolumn{1}{c}{Model}&\multicolumn{1}{c}{Model}\\
\midrule
\emph{Panel: IV}           &                      &                      &                      &                      &                      &                      \\
Cumulative capacity (MW)   &        0.037\sym{**} &                      &       -0.037\sym{**} &                      &        0.020         &                      \\
                           &      (0.014)         &                      &      (0.014)         &                      &      (0.017)         &                      \\
Cumulative count           &                      &        0.062\sym{**} &                      &       -0.062\sym{**} &                      &        0.034         \\
                           &                      &      (0.025)         &                      &      (0.025)         &                      &      (0.028)         \\
\midrule
Observations               &          770         &          770         &          770         &          770         &          689         &          689         \\
Districts                  &          193         &          193         &          193         &          193         &          193         &          193         \\
\(R^{2}\)                  &         0.83         &         0.83         &         0.83         &         0.83         &         0.62         &         0.62         \\
\bottomrule
\multicolumn{7}{l}{\footnotesize \sym{*} \(p<0.10\), \sym{**} \(p<0.05\), \sym{***} \(p<0.01\)}\\
\end{tabular*}
}
